Did you have any issues with screwing them into the charger? That's the only thing I didn't like about these, the charger. I thought the threads were totally wrong on one of them, and I was going to have to return it. So I decided to try screwing one of my cig style bats on it. It screwed it and seemed to loosen up or clean out the threads a bit. It's almost like you have to "break in" the chargers. Mine screw in easier once I used them several times. Still, the charger could use some remodeling for better quality but mine seem to work ok now.